/ Dictionary / Index L LDL: Meaning and Definition of Find definitions for: LDL Pronunciation: [key] — Biochem. Biochem. low-density lipoprotein. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ldl (Thesaurus) LDH L-dopa Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language